Average interaction cooperator numbers and reputation distribution in the population.

<p>Panel (a) depicts the average interaction cooperator numbers of a cooperator () and a defector () as a function of time step <i>t</i>. Panel (b) depicts the contour plot of reputation distribution in the population drawn as a function of time step <i>t</i>. It can be observed that during the evolutionary process different cooperators’ clusters are typically maintained in the population, leading to interaction segregation in purely cooperative populations. Here, and other parameters are the same as those in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0036260#pone-0036260-g001" target="_blank">Fig. 1</a>.